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CHAPTER 7 ENC APS ULATIN G AN D PA CK AGING YOUR C ODE
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let (private fireTickEvent,public TickEvent) = IEvent.create<TickTock>() let internal oneTick() = (clock := match !clock with Tick -> Tock | Tock -> Tick); fireTickEvent (!clock) module internal TickTockDriver = open System.Threading let timer = new Timer(callback=(fun _ -> GlobalClock.oneTick()), state=null,dueTime=0,period=100) In Listing 7-4, the private state is clock. The assembly-internal module TickTockDriver uses the System.Threading.Timer class to drive the alternation of the state via the internal function oneTick. The GlobalClock module publishes one IEvent value, TickEvent, which any client can use to add handlers to listen for the event. Note that you can give different accessibility annotations for different identifiers bound in the same pattern. The following line from the sample uses the IEvent.create function to return a pair, and the elements of this pair are given different accessibilities. We cover the use of IEvent.create to create events in more detail in 8. let (private fireTickEvent,public TickEvent) = IEvent.create<TickTock>() Another assembly can now contain the following code that adds a handler to TickEvent: module TickTockListener = do GlobalClock.TickEvent.Add(function | GlobalClock.Tick -> printf "tick!" | GlobalClock.Tock -> System.Windows.Forms.MessageBox.Show "tock!" |> ignore) You can add accessibility annotations at quite a number of places in F# code: In let, module, type, and extern definitions in modules, and in individual identifiers in patterns In new(...) object constructor definitions and member definitions associated with types
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Note You cannot add accessibility annotations to type abbreviations. That is, if you define a type abbreviation such as type label = int and label is a public type, then all users of the type label know that it is really just an abbreviation for int and not a distinct type definition of its own. This is because .NET provides no way to hide type abbreviations, and indeed the F# compiler expands type abbreviations in the underlying generated .NET IL code.
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Listing 7-5 shows a type where some methods and properties are labeled public but the methods that mutate the underlying collection (Add and the set method associated with the Item property) are labeled internal.
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Listing 7-5. Making Property Setters Internal to a Type Definition open System.Collections.Generic type public SparseVector() = let elems = new SortedDictionary<int,float>() member internal v.Add(k,v) = elems.Add(k,v) member public v.Count = elems.Keys.Count member v.Item with public get i = if elems.ContainsKey(i) then elems.[i] else 0.0 and internal set i v = elems.[i] <- v
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Note By default let bindings in types are private to the object being constructed, and all member bindings are public, that is, have the same accessibility as the type definition. This is a useful default because it corresponds to the common situation where internal implementation details are fully private and published constructs are available widely and because omitting accessibility annotations makes code more readable in the common case. However, when you start to add more specific accessibility annotations, such as by making individual members internal or private, then it is useful to explicitly mark all members with accessibility annotations. This will make your code more readable because readers will not have to remember that unmarked members are public. You can leave the remaining let bindings unmarked and implicitly private. In short, we recommend that if you mark any members of a type with accessibility annotations, then mark them all.
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Using Namespaces and Modules
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An important organizational technique is to give sensible qualified names to your types and values. A qualified name is, for example, Microsoft.FSharp.Collections.List (for the F# list type) or System.IO.StreamReader (for one of the types in the .NET Framework BCL). Qualified names are particularly important when writing frameworks to be used by other people and are also a useful way of organizing your own code. You give your types and functions qualified names by placing them in namespaces, modules, and type definitions. Table 7-1 shows these three kinds of containers and what they can contain. For completeness, we ve included type abbreviations, which are slightly different because you can t use them as a container for other constructs.
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